CN117977662B - Control method of energy storage system - Google Patents
Control method of energy storage system Download PDFInfo
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- CN117977662B CN117977662B CN202410371026.0A CN202410371026A CN117977662B CN 117977662 B CN117977662 B CN 117977662B CN 202410371026 A CN202410371026 A CN 202410371026A CN 117977662 B CN117977662 B CN 117977662B
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- 238000004146 energy storage Methods 0.000 title claims abstract description 74
- 238000000034 method Methods 0.000 title claims abstract description 62
- HEZMWWAKWCSUCB-PHDIDXHHSA-N (3R,4R)-3,4-dihydroxycyclohexa-1,5-diene-1-carboxylic acid Chemical compound O[C@@H]1C=CC(C(O)=O)=C[C@H]1O HEZMWWAKWCSUCB-PHDIDXHHSA-N 0.000 claims abstract description 83
- 239000003990 capacitor Substances 0.000 claims abstract description 73
- 238000006243 chemical reaction Methods 0.000 claims abstract description 33
- 230000003247 decreasing effect Effects 0.000 claims description 3
- 238000012545 processing Methods 0.000 description 7
- 238000004092 self-diagnosis Methods 0.000 description 7
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- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012983 electrochemical energy storage Methods 0.000 description 2
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Abstract
The invention discloses a control method of an energy storage system, the energy storage system comprises at least one battery cluster and a control circuit which is arranged in one-to-one correspondence with the battery cluster, the control circuit is connected between the battery cluster and a bus, the control circuit comprises a DCDC module, the DCDC module comprises an output capacitor, and when the bus has voltage, the control method comprises the following steps: the control circuit is used for pre-charging the output capacitor; after the voltage of the output capacitor is matched with the voltage of the battery cluster, controlling the DCDC module to perform voltage conversion on the output voltage of the connected battery cluster according to the first reference voltage and outputting the first voltage; if the difference value between the voltage of the bus and the first voltage is larger than or equal to a first preset value, the first reference voltage is adjusted according to the voltage of the bus; and if the difference between the voltage of the bus and the first voltage is smaller than a first preset value, connecting the battery cluster with the bus in parallel. The problem that the energy storage system is damaged due to current circulation generated by overlarge voltage difference when different battery clusters are connected is avoided.
Description
Technical Field
The invention relates to the technical field of energy storage, in particular to a control method of an energy storage system.
Background
In recent years, with the development of new energy technology, electrochemical energy storage is becoming a trend of large-scale development of energy storage.
The existing electrochemical energy storage system improves the capacity of the energy storage system through parallel connection of a plurality of battery clusters, when the battery clusters with different charge states or different ageing degrees are used in parallel, pressure difference exists, so that current circulation is generated among the plurality of battery clusters, and the energy storage system can be damaged seriously.
Disclosure of Invention
The invention provides a control method of an energy storage system, which is used for solving the problem of current circulation generated when different battery clusters are used in parallel.
According to an aspect of the present invention, there is provided a control method of an energy storage system, the energy storage system including at least one battery cluster, and a control circuit disposed in one-to-one correspondence with the battery cluster, the control circuit being connected between the battery cluster and a bus, the control circuit including a DCDC module including an output capacitor, the control method including, when the bus has a voltage:
after receiving the grid-connected instruction, the control circuit is controlled to precharge the output capacitor;
after the voltage of the output capacitor is matched with the voltage of the battery cluster, controlling the DCDC module to perform voltage conversion on the output voltage of the connected battery cluster according to the first reference voltage and outputting the first voltage;
if the difference value between the voltage of the bus and the first voltage is larger than or equal to a first preset value, the first reference voltage is adjusted according to the voltage of the bus;
and if the difference between the voltage of the bus and the first voltage is smaller than a first preset value, connecting the battery cluster with the bus in parallel.
Optionally, if the difference between the voltage of the bus and the first voltage is greater than or equal to a first preset value, adjusting the first reference voltage according to the voltage of the bus includes:
The first reference voltage is gradually increased or gradually decreased in a step mode according to a preset fixed step size.
Optionally, the difference between adjacent first reference voltages is gradually reduced.
Optionally, the control circuit further comprises a main negative contactor and a pre-charging contactor, the battery cluster comprises a positive electrode and a negative electrode, the pre-charging contactor is connected between the positive electrode of the battery cluster and the DCDC module, and the main negative contactor is connected between the negative electrode of the battery cluster and the bus; before the control circuit precharges the output capacitor, the control circuit further comprises:
Judging whether the battery cluster has faults or not;
When the battery cluster has no fault, the main negative contactor and the pre-charging contactor are controlled to be closed.
Optionally, the energy storage system further comprises an energy storage converter, and the energy storage converter is connected with the bus; an output contactor is also connected between the DCDC module and the bus; when the bus is not at voltage, the control method further comprises the following steps:
After receiving the grid-connected instruction, the control circuit is controlled to precharge the output capacitor and the capacitor of the energy storage converter at the same time;
after the voltage of the bus is matched with the voltage of the battery cluster, controlling a DCDC module corresponding to the battery cluster to perform voltage conversion on the output voltage of the battery cluster according to a second reference voltage and outputting the second voltage;
And when the difference value between the second voltage and the preset bus voltage is greater than or equal to a second preset value, adjusting the second reference voltage according to the preset bus voltage.
Optionally, when the difference between the second voltage and the preset bus voltage is smaller than a second preset value, determining that the grid connection is successful.
Optionally, the control circuit further comprises a main negative contactor and a pre-charging contactor, the battery cluster comprises a positive electrode and a negative electrode, the pre-charging contactor is connected between the positive electrode of the battery cluster and the DCDC module, and the main negative contactor is connected between the negative electrode of the battery cluster and the bus; before the control circuit simultaneously precharges the output capacitor and the capacitor of the energy storage converter, the control circuit further comprises:
Judging whether the battery cluster has faults or not;
When the battery cluster has no fault, the main negative contactor, the pre-charging contactor and the output contactor are controlled to be closed.
Optionally, the control circuit further includes a main positive contactor and a pre-charging contactor, the battery cluster includes a positive electrode and a negative electrode, the main positive contactor is connected between the positive electrode of the battery cluster and the DCDC module, and the pre-charging contactor is also connected between the positive electrode of the battery cluster and the DCDC module; after the voltage of the bus is matched with the voltage of the battery cluster, controlling the DCDC module corresponding to the battery cluster to perform voltage conversion on the output voltage of the battery cluster according to the second reference voltage and outputting the second voltage, wherein the method comprises the following steps:
Controlling to close the main positive contactor and controlling to open the pre-charging contactor;
The operating mode of the control DCDC module is a voltage source mode.
Optionally, an output contactor is also connected between the DCDC module and the bus; if the difference between the voltage of the bus and the first voltage is smaller than a first preset value, before the battery cluster is connected with the bus in parallel, the method comprises the following steps:
And controlling to close the output contactor.
Optionally, the control circuit further comprises a main positive contactor, a main negative contactor, a pre-charging resistor and a pre-charging contactor, wherein the battery cluster comprises a positive electrode and a negative electrode, the main positive contactor is connected between the positive electrode of the battery cluster and the DCDC module, the pre-charging contactor and the pre-charging resistor are connected in series and then connected with the main positive contactor in parallel, and the main negative contactor is connected between the negative electrode of the battery cluster and the bus; after the voltage of the output capacitor is matched with the voltage of the battery cluster, controlling the DCDC module to perform voltage conversion on the output voltage of the connected battery cluster according to the first reference voltage and output the first voltage, wherein the method comprises the following steps:
Controlling to close the main positive contactor and controlling to open the pre-charging contactor;
The operating mode of the control DCDC module is a voltage source mode.
According to the technical scheme, when the bus has voltage, the DCDC module is arranged to perform voltage conversion processing on the output voltage of the battery cluster and output the first voltage, and when the difference value between the first voltage and the voltage of the bus is larger than or equal to a first preset value, the first reference voltage is continuously adjusted until the difference value between the first voltage and the voltage of the bus is smaller than the first preset value. When different battery clusters are connected, the difference value between the first voltage output by the corresponding DCDC module and the voltage of the bus is smaller than a first preset value, and the problem that an energy storage system is damaged due to current circulation caused by overlarge voltage difference when different battery clusters are connected is avoided. Meanwhile, the BCU can control the conversion strength of the DCDC module to the voltage of the battery cluster by adjusting the first reference voltage, so that the control of the output of the battery cluster is achieved.
It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the invention or to delineate the scope of the invention. Other features of the present invention will become apparent from the description that follows.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a control method of an energy storage system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an energy storage system according to an embodiment of the present invention;
FIG. 3 is a flow chart of another method for controlling an energy storage system according to an embodiment of the present invention;
FIG. 4 is a flow chart of another method for controlling an energy storage system according to an embodiment of the present invention;
FIG. 5 is a flow chart of another method for controlling an energy storage system according to an embodiment of the present invention;
FIG. 6 is a flow chart of another method for controlling an energy storage system according to an embodiment of the present invention;
FIG. 7 is a flow chart of another method for controlling an energy storage system according to an embodiment of the present invention;
fig. 8 is a flowchart of another control method of an energy storage system according to an embodiment of the present invention.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Fig. 1 is a flowchart of a control method of an energy storage system according to an embodiment of the present invention, and fig. 2 is a schematic structural diagram of an energy storage system according to an embodiment of the present invention. As shown in fig. 2, the energy storage system includes at least one battery cluster 1 and a control circuit 2 disposed in one-to-one correspondence with the battery cluster 1, the control circuit 2 is connected between the battery cluster 1 and the bus, the control circuit 2 includes a DCDC module 21, and the DCDC module 21 includes an output capacitor C1. The DCDC module 21 may further include an inductor L1, a first diode D1, a second diode D2, a first transistor Q1, and a second transistor Q2, so that the DCDC module 21 performs a function of voltage conversion on the output voltage of the battery cluster 1. The energy storage system can further comprise a breaker CB, a fuse FU and a shunt RS, and the breaker CB and the fuse FU can be disconnected in time when the energy storage system breaks down, so that other circuit elements are protected. The BCU can measure the loop current by detecting the voltage across the shunt RS. The energy storage system further comprises a battery system management unit (Battery Array Unit, BAU) and a battery cluster management unit (Battery Cluster Unit, BCU) which is arranged in one-to-one correspondence with the battery clusters 1, wherein the BAU is a higher-level management unit of the BCU, the BAU is connected with the BCU, and the BCU is connected with the control circuit 2 and the battery clusters 1. The energy storage system further comprises an energy storage converter 3, the energy storage converter 3 is connected with the bus, the energy storage converter 3 comprises a DC/AC module 31, and the DC/AC module 31 is used for converting the voltage of the bus into alternating current and accessing the alternating current to the power grid; and also for converting the ac power of the grid into dc power for charging the battery cluster 1. When the bus has voltage, the situation that the grid connection of the battery cluster 1 is successful can be correspondingly met, and the battery cluster 1 is integrated into the bus and provides the voltage of the bus. The control method in this case may be described as a second grid-connected method, as shown in fig. 1, and includes:
step 110: the control circuit precharges the output capacitance.
Specifically, as shown in fig. 2, the BAU issues a grid-connected instruction according to an external input, and the BCU receives the grid-connected instruction issued by the BAU and controls the control circuit 2 to precharge the output capacitor C1. The precharge can control the charging current, ensure to charge the output capacitor C1 stably, and avoid the damage of the energy storage system caused by large current.
Step 120: after the voltage of the output capacitor is matched with the voltage of the battery cluster, controlling the DCDC module to perform voltage conversion on the output voltage of the connected battery cluster according to the first reference voltage and outputting the first voltage.
In the embodiment of the present invention, the first reference voltage is preset by the BCU according to the voltage condition of the bus, and exemplary, the first reference voltage may be the same as the voltage of the bus.
Specifically, as shown in fig. 2, the BCU control circuit 2 pre-charges the output capacitor C1 and waits for a certain time, and when the difference between the voltage of the output capacitor C1 and the voltage of the battery cluster 1 is smaller than a preset value, the preset value is preset by the BCU according to the actual situation, which indicates that the voltage of the output capacitor C1 matches the voltage of the battery cluster 1 at this time, and the pre-charging is successful. The BCU controls the DCDC module 21 to operate, and the DCDC module 21 performs voltage conversion processing on the output voltage of the battery cluster 1 with the first reference voltage as a reference and outputs the first voltage.
Step 130: and judging whether the difference value between the first voltage and the voltage of the bus is smaller than a first preset value.
In the embodiment of the present invention, the first preset value is preset by the BCU according to specific situations, and is used to determine whether the battery cluster 1 can be incorporated into the bus bar. The difference between the first voltage and the voltage of the bus is smaller than a first preset value, and the circulation generated by the battery clusters 1 after being integrated into the bus is smaller or does not exist.
Specifically, the BCU obtains the voltage of the bus, and makes a difference between the first voltage and the voltage of the bus to obtain a voltage difference between the first voltage and the voltage of the bus, and the BCU determines whether the difference between the first voltage and the voltage of the bus is smaller than a first preset value, and if the difference between the voltage of the bus and the first voltage is greater than or equal to the first preset value, step 141 is executed; if the difference between the voltage of the bus and the first voltage is less than the first preset value, step 142 is performed.
Step 141: the first reference voltage is adjusted according to the voltage of the bus.
Specifically, as shown in fig. 2, the difference value between the two is compared with a first preset value, if the difference value between the two is greater than or equal to the first preset value, the BCU readjusts the first reference voltage according to the voltage of the bus, and the DCDC module 21 performs voltage conversion on the output voltage of the battery cluster 1 with the adjusted first reference voltage as a reference, so as to adjust the output first voltage until the difference value between the first voltage and the voltage of the bus is less than the first preset value. By adjusting the first reference voltage step by step, the voltage output by the battery cluster 1 is controlled to match the bus voltage, so that the battery clusters 1 with large differences are connected in parallel for use, and the circulation is suppressed.
Step 142: and connecting the battery cluster with the bus in parallel.
Specifically, as shown in fig. 2, if the difference between the first voltage and the voltage of the bus is smaller than the first preset value, the BCU controls the battery cluster 1 to be integrated into the bus, and the battery cluster 1 is successfully connected to the grid.
According to the technical scheme, when the bus has voltage, the DCDC module is arranged to perform voltage conversion processing on the output voltage of the battery cluster and output first voltage, and when the difference value between the first voltage and the voltage of the bus is larger than or equal to a first preset value, the first reference voltage is continuously adjusted until the difference value between the first voltage and the voltage of the bus is smaller than the first preset value. When different battery clusters are connected, the difference value between the first voltage output by the corresponding DCDC module and the voltage of the bus is smaller than a first preset value, and the problem that an energy storage system is damaged due to current circulation caused by overlarge voltage difference when different battery clusters are connected is avoided. Meanwhile, the BCU can control the conversion strength of the DCDC module to the voltage of the battery cluster by adjusting the first reference voltage, so that the control of the output of the battery cluster is achieved.
Optionally, step 141: adjusting the first reference voltage according to the voltage of the bus bar includes:
The first reference voltage is gradually increased or gradually decreased in a step mode according to a preset fixed step size.
In the embodiment of the invention, the preset fixed step length is preset by the BCU according to the voltage of the bus and is used for adjusting the voltage value of the first reference voltage.
Specifically, if the difference between the voltage of the bus and the first voltage is greater than or equal to a first preset value, the BCU increases or decreases the first reference voltage step by step in a step manner according to a preset fixed step length. When the first voltage is greater than the voltage of the bus and the difference value between the first voltage and the bus is greater than a first preset value, the BCU gradually decreases the first reference voltage in a step manner according to a preset fixed step length, and illustratively, the BCU may set the preset fixed step length to be 0.5V, the first reference voltage decreases by 0.5V, the dcdc module performs voltage conversion on the output voltage of the battery cluster with the adjusted first reference voltage as a reference, and further adjusts the output first voltage, and if the first voltage is still greater than the voltage of the bus and the difference value between the first voltage and the bus is greater than the first preset value, the BCU continues to gradually decrease the first reference voltage in a step manner according to the preset fixed step length, and illustratively, the BCU may set the preset fixed step length at the moment to be 0.3V, and the first reference voltage continues to decrease by 0.3V, and the dcdc module performs voltage conversion on the output voltage of the battery cluster with the adjusted first reference voltage as a reference, and further adjusts the output first voltage until the difference value between the first voltage and the voltage of the bus is less than the first preset value.
When the voltage of the bus is larger than the first voltage and the difference value between the two is larger than a first preset value, the BCU gradually increases the first reference voltage in a step mode according to a preset fixed step length, and the BCU can set the preset fixed step length to be 0.5V, and the first reference voltage is increased by 0.5V, and the dcdc module performs voltage conversion on the output voltage of the battery cluster by taking the adjusted first reference voltage as a reference, so as to adjust the output first voltage.
Optionally, the difference between adjacent first reference voltages is gradually reduced.
Specifically, if the difference between the voltage of the bus and the first voltage is greater than or equal to a first preset value, the BCU increases or decreases the first reference voltage step by step in a step manner according to a preset fixed step length. In the process that the BCU adjusts the first reference voltage until the difference value between the voltage of the bus and the first voltage is smaller than a first preset value, the preset fixed step length set by the BCU is gradually reduced, namely the difference value between adjacent first reference voltages is gradually reduced, and the BCU continuously adjusts the first reference voltage in a small amplitude until the difference value between the voltage of the bus and the first voltage is smaller than the first preset value. By the arrangement, the situation that the DCDC module is damaged due to unstable working state of the DCDC module caused by the fact that the BCU continuously adjusts the first reference voltage greatly can be avoided.
As shown in fig. 2, the control circuit 2 further includes a main negative contactor KM3 and a pre-charging contactor KM2, the battery cluster 1 includes a positive electrode and a negative electrode, the pre-charging contactor KM2 is connected between the positive electrode of the battery cluster 1 and the DCDC module 21, and the main negative contactor KM3 is connected between the negative electrode of the battery cluster 1 and the bus bar; fig. 3 is a flowchart of another control method of an energy storage system according to an embodiment of the present invention. As shown in fig. 3, the control method includes:
step 210: and receiving a grid-connected instruction issued by the BAU.
Specifically, the BAU issues a grid-connected instruction according to external input, and the BCU receives the grid-connected instruction issued by the BAU.
Step 220: BCU performs self-diagnosis.
Specifically, as shown in fig. 2, the BCU collects technical parameters of the battery cluster 1, and illustratively, the BCU may collect technical parameters such as voltage, current or temperature of the battery cluster 1, compare the technical parameters with preset technical parameters, and determine whether the battery cluster 1 has a fault.
Step 230: and judging whether the battery cluster has faults or not.
Specifically, as shown in fig. 2, the BCU determines whether the battery cluster 1 has a fault by collecting technical parameters of the battery cluster 1, if the battery cluster 1 has no fault, step 240 is performed, and if the battery cluster 1 has a fault, step 220 is repeatedly performed.
Step 240: the main negative contactor and the pre-charge contactor are controlled to be closed.
In the embodiment of the invention, the main negative contactor KM3 and the pre-charging contactor KM2 are switching devices for controlling on/off through BCU.
Specifically, as shown in fig. 2, if the battery cluster 1 has no fault, the BCU controls the main negative contactor KM3 and the pre-charging contactor KM2 to be closed, and the battery cluster 1 pre-charges the output capacitor C1.
Step 250: the control circuit precharges the output capacitance.
Step 260: after the voltage of the output capacitor is matched with the voltage of the battery cluster, controlling the DCDC module to perform voltage conversion on the output voltage of the connected battery cluster according to the first reference voltage and outputting the first voltage.
Step 270: and judging whether the difference value between the first voltage and the voltage of the bus is smaller than a first preset value.
Specifically, the BCU determines whether the difference between the first voltage and the voltage of the bus is less than a first preset value, and if the difference between the voltage of the bus and the first voltage is greater than or equal to the first preset value, step 281 is executed; if the difference between the voltage of the bus and the first voltage is less than the first preset value, step 282 is performed.
Step 281: the first reference voltage is adjusted according to the voltage of the bus.
Step 282: and connecting the battery cluster with the bus in parallel.
As shown in fig. 2, an output contactor KM4 is further connected between the DCDC module 21 and the bus bar; fig. 4 is a flowchart of another control method of an energy storage system according to an embodiment of the present invention. As shown in fig. 4, the method includes:
Step 310: and receiving a grid-connected instruction issued by the BAU.
Step 320: BCU performs self-diagnosis.
Step 330: and judging whether the battery cluster has faults or not.
If there is no failure in the battery cluster 1, step 340 is performed, and if there is a failure in the battery cluster 1, step 320 is repeatedly performed.
Step 340: the main negative contactor and the pre-charge contactor are controlled to be closed.
Step 350: the control circuit precharges the output capacitance.
Step 360: after the voltage of the output capacitor is matched with the voltage of the battery cluster, controlling the DCDC module to perform voltage conversion on the output voltage of the connected battery cluster according to the first reference voltage and outputting the first voltage.
Step 370: and judging whether the difference value between the first voltage and the voltage of the bus is smaller than a first preset value.
Specifically, the BCU determines whether the difference between the first voltage and the voltage of the bus is smaller than a first preset value, and if the difference between the voltage of the bus and the first voltage is greater than or equal to the first preset value, step 381 is executed; if the difference between the voltage of the bus and the first voltage is less than the first preset value, step 382 is performed.
Step 381: the first reference voltage is adjusted according to the voltage of the bus.
Step 382: and controlling to close the output contactor.
Specifically, as shown in fig. 2, when the difference between the first voltage output by the DCDC module 21 and the voltage of the bus is smaller than the first preset value, it is indicated that the battery cluster 1 meets the grid connection requirement at this time, the BCU controls the output contactor KM4 to be closed, the battery cluster 1 is integrated into the bus, and the grid connection of the battery cluster 1 is successful.
Step 390: and connecting the battery cluster with the bus in parallel.
Through setting up output contactor, can realize that when the capacity of a certain battery cluster is less and can lead to other battery clusters's capacity can not be utilized, control and the output contactor that the battery cluster that the capacity is less corresponds the setting is cut off all the time, cuts out the battery cluster trouble that the capacity is less, avoids producing the influence to other battery clusters.
As shown in fig. 2, the control circuit 2 further includes a main positive contactor KM1 and a precharge resistor R1, the main positive contactor KM1 is connected between the positive electrode of the battery cluster 1 and the DCDC module 21, and the precharge contactor KM2 and the precharge resistor R1 are connected in series and then connected in parallel with the main positive contactor KM 1; fig. 5 is a flowchart of another control method of an energy storage system according to an embodiment of the present invention. As shown in fig. 5, the method includes:
step 400: and receiving a grid-connected instruction issued by the BAU.
Step 410: BCU performs self-diagnosis.
Step 420: and judging whether the battery cluster has faults or not.
If there is no failure in the battery cluster 1, step 430 is performed, and if there is a failure in the battery cluster 1, step 410 is repeatedly performed.
Step 430: the main negative contactor and the pre-charge contactor are controlled to be closed.
Step 440: the control circuit precharges the output capacitance.
Step 450: and judging whether the difference value between the voltage of the output capacitor and the voltage of the battery cluster is smaller than a preset value.
In the embodiment of the invention, the preset value is preset by the BCU according to the actual situation, and is used for judging whether the output capacitor C1 is successfully precharged by the battery cluster 1.
Specifically, as shown in fig. 2, the BCU calculates the difference between the voltage of the output capacitor C1 and the voltage of the battery cluster 1, compares the difference with a preset value, executes step 460 when the difference between the voltage of the output capacitor C1 and the voltage of the battery cluster 1 is smaller than the preset value, and indicates that the precharge fails when the difference between the voltage of the output capacitor C1 and the voltage of the battery cluster 1 is greater than or equal to the preset value, and then needs to overhaul the energy storage system, and the precharge of the output capacitor C1 is completed after the overhaul is completed.
Step 460: and controlling to close the main positive contactor and controlling to open the pre-charging contactor.
Specifically, as shown in fig. 2, after the BCU determines that the difference between the voltage of the output capacitor C1 and the voltage of the battery cluster 1 is smaller than the preset value, the BCU controls to close the main positive contactor KM1 and controls to open the pre-charging contactor KM2, and at this time, the pre-charging is completed.
Step 470: the operating mode of the control DCDC module is a voltage source mode.
In the embodiment of the present invention, the voltage source mode is an operation mode for controlling the output voltage of the DCDC module 21 to be constant.
Specifically, as shown in fig. 2, the BCU controls the DCDC module 21 to operate, sets the operation mode of the DCDC module 21 to be a voltage source mode, and sets a first reference voltage, so that the output voltage of the DCDC module 21 is stabilized at the first reference voltage. The DCDC module 21 performs a voltage conversion process on the output voltage of the battery cluster 1 with reference to the first reference voltage and outputs the first voltage, at which time the first voltage is the same as the first reference voltage.
Step 480: and judging whether the difference value between the first voltage and the voltage of the bus is smaller than a first preset value.
Specifically, the BCU determines whether the difference between the first voltage and the voltage of the bus is smaller than a first preset value, and if the difference between the voltage of the bus and the first voltage is greater than or equal to the first preset value, step 491 is executed; if the difference between the voltage of the bus and the first voltage is less than the first preset value, step 492 is performed.
Step 491: the first reference voltage is adjusted according to the voltage of the bus.
Step 492: and controlling to close the output contactor.
Step 493: and connecting the battery cluster with the bus in parallel.
Fig. 6 is a flowchart of another control method of an energy storage system according to an embodiment of the present invention. When the bus is not under voltage, no battery cluster 1 is integrated into the bus, and the control method in this case can be described as a first grid-connected mode. As shown in fig. 6, the control method further includes:
step 510: the control circuit simultaneously precharges the output capacitance and the capacitance of the energy storage converter.
Specifically, as shown in fig. 2, the BAU issues a grid-connected instruction according to an external input, and the BCU receives the grid-connected instruction issued by the BAU and controls the control circuit 2 to precharge the output capacitor C1 and the capacitor C2 of the energy storage converter 3. The precharge can control the charging current to ensure that the output capacitor C1 and the capacitor C2 of the energy storage converter 3 can be charged smoothly. Since the DCDC module 21 has the output capacitor C1 inside, a capacitor will also exist outside the application scene battery cluster 1. When a plurality of battery clusters 1 are applied in parallel, each capacitor needs to be precharged, and each battery cluster 1 maintains a consistent output voltage, so that battery clusters 1 with large differences can be used in parallel.
Step 520: after the voltage of the bus is matched with the voltage of the battery cluster, controlling the DCDC module corresponding to the battery cluster to perform voltage conversion on the output voltage of the battery cluster according to the second reference voltage and outputting the second voltage.
In the embodiment of the present invention, the second reference voltage is preset by the BCU according to the preset bus voltage, and exemplary, the second reference voltage may be the same as the preset bus voltage. The preset bus voltage is preset by the BCU according to actual requirements.
Specifically, as shown in fig. 2, the BCU control circuit 2 pre-charges the output capacitor C1 and the capacitor C2 of the energy storage converter 3 and waits for a certain time, when the difference between the voltages of the output capacitor C1 and the capacitor C2 of the energy storage converter 3 and the voltage of the battery cluster 1 is smaller than a preset value, the preset value is preset by the BCU according to the actual situation, which indicates that the voltages of the output capacitor C1 and the capacitor C2 of the energy storage converter 3 are matched with the voltage of the battery cluster 1 at this time, and the pre-charging is successful, because the BCU control output contactor KM4 is closed before the pre-charging, the voltage of the bus is also matched with the voltage of the battery cluster 1 at this time. The BCU controls the DCDC module 21 to operate, and the DCDC module 21 performs voltage conversion processing on the output voltage of the battery cluster 1 with the second reference voltage as a reference and outputs a second voltage, where the second voltage is the voltage of the bus.
Step 530: and judging whether the difference value between the second voltage and the preset bus voltage is smaller than a second preset value.
In the embodiment of the present invention, the second preset value is preset by the BCU according to specific situations, and is used to determine whether the battery cluster 1 can be incorporated into the bus bar.
Specifically, the BCU sets a preset bus voltage, and makes a difference between the second voltage and the preset bus voltage to obtain a voltage difference between the second voltage and the preset bus voltage, and the BCU determines whether the difference between the second voltage and the preset bus voltage is smaller than a second preset value, and if the difference between the second voltage and the preset bus voltage is greater than or equal to the second preset value, step 541 is executed; if the difference between the second voltage and the preset bus voltage is less than the second preset value, step 542 is performed.
Step 541: and adjusting the second reference voltage according to the preset bus voltage.
Specifically, as shown in fig. 2, the difference between the second voltage and the preset bus voltage is compared with a second preset value, if the difference between the second voltage and the preset bus voltage is greater than or equal to the second preset value, the BCU readjusts the second reference voltage according to the preset bus voltage, and the DCDC module 21 performs voltage conversion on the output voltage of the battery cluster 1 with the adjusted second reference voltage as a reference, so as to adjust the output second voltage until the difference between the second voltage and the preset bus voltage is less than the second preset value.
Optionally, with continued reference to fig. 6, when the difference between the second voltage and the preset bus voltage is less than the second preset value, step 542 is executed: and determining that the grid connection is successful.
Specifically, as shown in fig. 2, if the difference between the second voltage and the preset bus voltage is smaller than the second preset value, the BCU controls the battery cluster 1 to be integrated into the bus, and the battery cluster 1 is successfully connected to the grid.
According to the technical scheme, when the bus is not provided with voltage, the DCDC module is arranged to perform voltage conversion processing on the output voltage of the battery cluster and output second voltage, the second voltage is input to the bus at the moment, so that the second voltage is the voltage of the bus at the moment, when the difference value between the second voltage and the preset bus voltage is larger than or equal to a second preset value, the second reference voltage is continuously adjusted until the difference value between the second voltage and the preset bus voltage is smaller than the second preset value, when the difference value between the second voltage and the preset bus voltage is smaller than the second preset value, the BCU controls the battery cluster to be integrated into the bus, the battery cluster is successfully connected, after the battery cluster is successfully connected, the bus has voltage, and then the other battery clusters can be connected according to the control method of the energy storage system when the bus has voltage provided by any embodiment.
Fig. 7 is a flowchart of another control method of an energy storage system according to an embodiment of the present invention. As shown in fig. 7, the control method includes:
Step 600: and receiving a grid-connected instruction issued by the BAU.
Specifically, the BAU issues a grid-connected instruction according to external input, and the BCU receives the grid-connected instruction issued by the BAU.
Step 610: BCU performs self-diagnosis.
Specifically, as shown in fig. 2, the BCU collects technical parameters of the battery cluster 1, and illustratively, the BCU may collect technical parameters such as voltage, current or temperature of the battery cluster 1, and determine whether the battery cluster 1 has a fault.
Step 620: and judging whether the battery cluster has faults or not.
Specifically, as shown in fig. 2, the BCU determines whether the battery cluster 1 has a fault by collecting technical parameters of the battery cluster 1, if the battery cluster 1 has no fault, step 630 is performed, and if the battery cluster 1 has a fault, step 610 is repeatedly performed.
Step 630: and controlling to close the main negative contactor, the pre-charging contactor and the output contactor.
In the embodiment of the present invention, the output contactor KM4 is a switching device that controls on/off through BCU.
Specifically, as shown in fig. 2, if the battery cluster 1 has no fault, the BCU controls the main negative contactor KM3, the pre-charging contactor KM2, and the output contactor KM4 to be closed, and the battery cluster 1 pre-charges the output capacitor C1 and the capacitor C2 of the energy storage converter 3.
Step 640: the control circuit simultaneously precharges the output capacitance and the capacitance of the energy storage converter.
Step 650: after the voltage of the bus is matched with the voltage of the battery cluster, controlling the DCDC module corresponding to the battery cluster to perform voltage conversion on the output voltage of the battery cluster according to the second reference voltage and outputting the second voltage.
Step 660: and judging whether the difference value between the second voltage and the preset bus voltage is smaller than a second preset value.
Specifically, if the difference between the second voltage and the preset bus voltage is greater than or equal to the second preset value, step 671 is performed; if the difference between the second voltage and the preset bus voltage is less than the second preset value, step 672 is performed.
Step 671: and adjusting the second reference voltage according to the preset bus voltage.
Step 672: and determining that the grid connection is successful.
Fig. 8 is a flowchart of another control method of an energy storage system according to an embodiment of the present invention. As shown in fig. 8, the method includes:
step 700: and receiving a grid-connected instruction issued by the BAU.
Step 710: BCU performs self-diagnosis.
Step 720: and judging whether the battery cluster has faults or not.
If there is no failure in the battery cluster 1, step 730 is performed, and if there is a failure in the battery cluster 1, step 710 is repeatedly performed.
Step 730: and controlling to close the main negative contactor, the pre-charging contactor and the output contactor.
Step 740: the control circuit pre-charges the output capacitance and the capacitance of the energy storage converter.
Step 750: and judging whether the difference value between the voltage of the bus and the voltage of the battery cluster is smaller than a preset value.
In the embodiment of the invention, the preset value is preset by the BCU according to the actual situation, and is used for judging whether the output capacitor C1 and the capacitor C2 of the energy storage converter are successfully pre-charged by the battery cluster 1.
Specifically, as shown in fig. 2, the voltage of the output capacitor C1 and the capacitor C2 of the energy storage converter is the voltage of the bus, the BCU calculates the difference between the voltage of the bus and the voltage of the battery cluster 1 and compares the difference with a preset value, when the difference between the voltage of the bus and the voltage of the battery cluster 1 is smaller than the preset value, step 760 is executed, and when the difference between the voltage of the bus and the voltage of the battery cluster 1 is greater than or equal to the preset value, a precharge failure is indicated, and at this time, the energy storage system needs to be overhauled, and the output capacitor C1 and the capacitor C2 of the energy storage converter need to be overhauled to be reappeared.
Step 760: and controlling to close the main positive contactor and controlling to open the pre-charging contactor.
Specifically, as shown in fig. 2, after the BCU determines that the difference between the voltage of the bus and the voltage of the battery cluster 1 is smaller than the preset value, the BCU controls to close the main positive contactor KM1 and controls to open the pre-charging contactor KM2, and at this time, the pre-charging is completed.
Step 770: the operating mode of the control DCDC module is a voltage source mode.
Specifically, as shown in fig. 2, the BCU controls the DCDC module 21 to operate, sets the operation mode of the DCDC module 21 to be the voltage source mode, and sets the second reference voltage, so that the output voltage of the DCDC module 21 is stabilized at the second reference voltage. The DCDC module 21 performs voltage conversion processing on the output voltage of the battery cluster 1 with reference to the second reference voltage and outputs the second voltage, at which time the second voltage is the same as the second reference voltage.
Step 780: and judging whether the difference value between the second voltage and the preset bus voltage is smaller than a second preset value.
Specifically, the BCU determines whether the difference between the second voltage and the preset bus voltage is less than a second preset value, and if the difference between the second voltage and the preset bus voltage is greater than or equal to the second preset value, executes step 791; if the difference between the second voltage and the preset bus voltage is less than the second preset value, step 792 is performed.
Step 791: and adjusting the second reference voltage according to the preset bus voltage.
Step 792: and determining that the grid connection is successful.
In practical application, the following grid-connected mode can be adopted:
The BAU receives an externally input grid-connected instruction and issues a request in a first grid-connected mode to one of the battery clusters 1.
After the first battery cluster 1 completes grid connection, a mark of the grid connection completion is returned to the BAU, and the BAU receives the return information of the battery cluster 1. And sequentially issuing requests in a second grid-connected mode to the rest battery clusters 1.
As shown in fig. 2, the BAU receives an external input grid-connected command, issues a request for a first grid-connected mode to one of the battery clusters 1, and the BCU receives the grid-connected command issued by the BAU and performs self-diagnosis, when the battery cluster 1 has no fault, the BCU controls the main negative contactor KM3, the pre-charging contactor KM2 and the output contactor KM4 to be closed, the battery cluster 1 pre-charges the output capacitor C1 and the capacitor C2 of the energy storage converter 3, and the voltage at both ends of the output capacitor C1 and the capacitor C2 of the energy storage converter 3 is the voltage of the bus at the same time. After the pre-charging is performed for a period of time, the BCU calculates the difference value between the voltage of the bus and the voltage of the battery cluster 1, compares the difference value with a preset value, and indicates that the pre-charging fails when the difference value between the voltage of the bus and the voltage of the battery cluster 1 is larger than or equal to the preset value, and then the energy storage system is required to be overhauled, and the output capacitor C1 and the capacitor C2 of the energy storage converter are precharged after the overhauling is completed. When the difference between the voltage of the bus and the voltage of the battery cluster 1 is smaller than a preset value, the BCU controls to close the main positive contactor KM1 and controls to open the pre-charging contactor KM2, and at the moment, pre-charging is completed. And then the BCU controls the DCDC module 21 to work, sets the working mode of the DCDC module 21 to be a voltage source mode, and sets a second reference voltage according to the preset bus voltage so as to enable the output voltage of the DCDC module 21 to be stabilized at the second reference voltage. The DCDC module 21 performs voltage conversion processing on the output voltage of the battery cluster 1 with reference to the second reference voltage and outputs the second voltage, at which time the second voltage is the same as the second reference voltage. The BCU determines whether the difference between the second voltage and the preset bus voltage is smaller than a second preset value, and if the difference between the second voltage and the preset bus voltage is larger than or equal to the second preset value, the BCU readjusts the second reference voltage according to the preset bus voltage, and the DCDC module 21 performs voltage conversion on the output voltage of the battery cluster 1 with the adjusted second reference voltage as a reference, so as to adjust the output second voltage until the difference between the second voltage and the preset bus voltage is smaller than the second preset value. If the difference between the second voltage and the preset bus voltage is smaller than a second preset value, the BCU controls the battery cluster 1 to be integrated into the bus, and the battery cluster 1 is successfully connected with the network.
And sequentially issuing a request of a second grid-connected mode to the rest battery clusters 1, receiving a grid-connected instruction issued by the BAU by the BCU, performing self-diagnosis, and controlling the main negative contactor KM3 and the pre-charging contactor KM2 to be closed by the BCU when no fault exists in the battery clusters 1, and pre-charging the output capacitor C1 by the battery clusters 1. After the precharge is performed for a period of time, the BCU calculates the difference between the voltage of the output capacitor C1 and the voltage of the battery cluster 1, compares the difference with a preset value, and indicates that the precharge fails when the difference between the voltage of the output capacitor C1 and the voltage of the battery cluster 1 is greater than or equal to the preset value, and then the energy storage system is required to be overhauled, and the precharge of the output capacitor C1 is performed after the overhaul is completed. When the difference between the voltage of the output capacitor C1 and the voltage of the battery cluster 1 is smaller than a preset value, the BCU controls to close the main positive contactor KM1 and controls to open the pre-charging contactor KM2, and at the moment, the pre-charging is completed. Then, the BCU controls the DCDC module 21 to operate, sets the operation mode of the DCDC module 21 to be a voltage source mode, and sets a first reference voltage according to the voltage of the bus, so that the output voltage of the DCDC module 21 is stabilized at the first reference voltage. The DCDC module 21 performs a voltage conversion process on the output voltage of the battery cluster 1 with reference to the first reference voltage and outputs the first voltage, at which time the first voltage is the same as the first reference voltage. The BCU determines whether the difference between the first voltage and the voltage of the bus is smaller than a first preset value, if the difference between the first voltage and the voltage of the bus is larger than or equal to the first preset value, the BCU readjust the first reference voltage according to the voltage of the bus, and the DCDC module 21 performs voltage conversion on the output voltage of the battery cluster 1 with the adjusted first reference voltage as a reference, so as to adjust the output first voltage until the difference between the first voltage and the voltage of the bus is smaller than the first preset value. If the difference between the first voltage and the voltage of the bus is smaller than a first preset value, the BCU controls the battery cluster 1 to be integrated into the bus, and the battery cluster 1 is successfully connected with the network. According to the technical scheme provided by the embodiment of the invention, each switch and the DCDC module in the combined control circuit enable battery clusters in different states to be connected in parallel for use, the first battery cluster is used for pre-charging the external capacitor and the internal capacitor together after being connected in parallel and then raising the output voltage of the first battery cluster to a certain value, and other battery clusters are used for pre-charging the internal capacitor and then raising the output voltage of the first battery cluster to be consistent with or approximate to a bus and then connected in a grid.
In the method of the energy storage system provided in any of the foregoing embodiments, the BCU may enable the battery clusters with large differences to be connected in parallel for use by setting and continuously adjusting the first reference voltage or the second reference voltage, and may suppress the circulation. The BCU precharges the various possible capacitances by controlling the precharge circuit and controlling the different contactors in combination to achieve very high control efficiency. Two different grid-connected processes are divided for two conditions of voltage of the bus and no voltage of the bus, and the battery cluster executes the different grid-connected processes according to different actual conditions so as to achieve grid connection of the whole energy storage system.
It should be appreciated that various forms of the flows shown above may be used to reorder, add, or delete steps. For example, the steps described in the present invention may be performed in parallel, sequentially, or in a different order, so long as the desired results of the technical solution of the present invention are achieved, and the present invention is not limited herein.
The above embodiments do not limit the scope of the present invention. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention.
Claims (9)
1. The control method of the energy storage system is characterized in that the energy storage system comprises at least one battery cluster and a control circuit which is arranged in one-to-one correspondence with the battery cluster, the control circuit is connected between the battery cluster and a bus, the control circuit comprises a DCDC module, the DCDC module comprises an output capacitor, and when the bus has voltage, the control method comprises the following steps:
after receiving a grid-connected instruction, controlling the control circuit to precharge the output capacitor;
After the voltage of the output capacitor is matched with the voltage of the battery cluster, controlling the DCDC module to perform voltage conversion on the output voltage of the connected battery cluster according to a first reference voltage and outputting the first voltage;
if the difference value between the voltage of the bus and the first voltage is larger than or equal to a first preset value, the first reference voltage is adjusted according to the voltage of the bus;
if the difference value between the voltage of the bus and the first voltage is smaller than the first preset value, the battery cluster is connected with the bus in parallel;
The energy storage system further comprises an energy storage converter, and the energy storage converter is connected with the bus; an output contactor is further connected between the DCDC module and the bus; when the bus is not in voltage, the control method further comprises the following steps:
After receiving a grid-connected instruction, controlling the control circuit to precharge the output capacitor and the capacitor of the energy storage converter simultaneously;
After the voltage of the bus is matched with the voltage of the battery cluster, controlling the DCDC module corresponding to the battery cluster to perform voltage conversion on the output voltage of the battery cluster according to a second reference voltage and outputting a second voltage;
And when the difference value between the second voltage and the preset bus voltage is larger than or equal to a second preset value, adjusting the second reference voltage according to the preset bus voltage.
2. The method of claim 1, wherein adjusting the first reference voltage based on the voltage of the bus bar if the difference between the voltage of the bus bar and the first voltage is greater than or equal to a first preset value comprises:
and gradually increasing or gradually decreasing the first reference voltage in a step mode according to a preset fixed step length.
3. The method of claim 2, wherein the difference between adjacent first reference voltages is gradually reduced.
4. The method of claim 1, wherein the control circuit further comprises a main negative contactor and a pre-charge contactor, the battery cluster comprising a positive pole and a negative pole, the pre-charge contactor being connected between the positive pole of the battery cluster and the DCDC module, the main negative contactor being connected between the negative pole of the battery cluster and the bus bar; before the control circuit performs the precharge on the output capacitor, the method further comprises:
Judging whether the battery cluster has faults or not;
and when the battery cluster has no fault, controlling to close the main negative contactor and the pre-charging contactor.
5. The method of claim 1, wherein the grid-tie is determined to be successful when the difference between the second voltage and the preset bus voltage is less than the second preset value.
6. The method of claim 1, wherein the control circuit further comprises a main negative contactor and a pre-charge contactor, the battery cluster comprising a positive pole and a negative pole, the pre-charge contactor being connected between the positive pole of the battery cluster and the DCDC module, the main negative contactor being connected between the negative pole of the battery cluster and the bus bar; before the control circuit performs the simultaneous precharge on the output capacitor and the capacitor of the energy storage converter, the method further includes:
Judging whether the battery cluster has faults or not;
and when the battery cluster has no fault, controlling to close the main negative contactor, the pre-charging contactor and the output contactor.
7. The method of claim 1, wherein the control circuit further comprises a main positive contactor and a pre-charge contactor, the battery cluster comprising a positive pole and a negative pole, the main positive contactor being connected between the positive pole of the battery cluster and the DCDC module, the pre-charge contactor also being connected between the positive pole of the battery cluster and the DCDC module; after the voltage of the bus is matched with the voltage of the battery cluster, controlling the DCDC module corresponding to the battery cluster to perform voltage conversion on the output voltage of the battery cluster according to a second reference voltage and outputting the second voltage, wherein the method comprises the following steps:
controlling to close the main positive contactor and controlling to open the pre-charging contactor;
and controlling the working mode of the DCDC module to be a voltage source mode.
8. The method of claim 1, wherein an output contactor is further connected between the DCDC module and the bus; if the difference between the voltage of the bus and the first voltage is smaller than a first preset value, before the battery cluster is connected with the bus in parallel, the method comprises the following steps:
and controlling to close the output contactor.
9. The method of claim 1, wherein the control circuit further comprises a main positive contactor, a main negative contactor, a pre-charge resistor, and a pre-charge contactor, the battery cluster comprising a positive electrode and a negative electrode, the main positive contactor being connected between the positive electrode of the battery cluster and the DCDC module, the pre-charge contactor and the pre-charge resistor being connected in series and then in parallel with the main positive contactor, the main negative contactor being connected between the negative electrode of the battery cluster and the bus bar; after the voltage of the output capacitor is matched with the voltage of the battery cluster, controlling the DCDC module to perform voltage conversion on the output voltage of the connected battery cluster according to a first reference voltage and output the first voltage, wherein the method comprises the following steps:
controlling to close the main positive contactor and controlling to open the pre-charging contactor;
and controlling the working mode of the DCDC module to be a voltage source mode.
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